
Samsung Galaxy E7
The latest firmware for Samsung Galaxy E7 (SM-E700M) is E700MUBS1BRJ1 with Android 5.1.1 (Lollipop), released on October 10, 2018 for 2 regions (CSC). Every official firmware build for SM-E700M, newest first: one row per build with all regions (CSC) that received it.
Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/E700MUBS1BRJ1
SM-E700M started on Android 4 and has received 1 major Android upgrade; it now runs Android 5.1.1 (Lollipop). The newest build, E700MUBS1BRJ1, was released on October 10, 2018. No new build has appeared for 97 months, so regular updates for this model have most likely ended.
Specifications of SM-E700H, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-E700H

SM-E500YZ

SM-E625F

SM-E5260

SM-E426S
The newest firmware for SM-E700M runs Android 5.1.1 (Lollipop): build E700MUBS1BRJ1, released on October 10, 2018.
The latest build for SM-E700M, E700MUBS1BRJ1, was released on October 10, 2018 (8 years ago).
SM-E700M has had no new firmware for 97 months, so regular updates have most likely ended.
Yes, all firmware files for SM-E700M are 100% official, original, and obtained directly from Samsung servers.
To flash SM-E700M, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SM-E700M.